Telephone- repeating-clrcult-and



(No Model.)

I W. .L. RICHARDS. TELEPHONE REPEATING CIRCUIT AND APPLIANCE.

No. 542,658. r Patented July 16, 1895.

' ivcly, a receiving "initting apparatus of the other in such men relay magnet, While the A, ilrrirnn hirer-res PATENT} @rricni -WlLlO'N LL RICHARDS, or MALDEN, ASSIGNOR o THE AMERICAN BELL 'lEi'JEPI IONE COMPANY, OF BOSTON,

MASSACHUSE'ITS.

MET AME? APPLEthNGEii.

srnoxrros'rron runnin ert orrsiteriiie e m No. assess, dated Jul is, 1885. App i n d March 16, 1895. Serial No. 542,031. tile model.)

To all whom it may concern: 7 Be it known that l, WILTON L. RICHARDS, residing at. Maiden, in the county of Suffolk and State of Massachusetts, haveinvented certain Improvements in TelephoneRepesting-Circuits and Appliances, which the following is a. specification.

This invention relates to telephone repeat-- ins-circuits or. to

appliances known generally as telephone repeaters err-clays. Itsobject' is to provide a reciprocallywpereting repeater to be placed at a station intermediate between two terminal stations in association with two circuits entering the said interme-' diate station and extending from the saidterminel stations, respectively. Each circuit is provided at the relay-station with two alternative branch extensions containing, respectapperetns and a transmitting apparatus, the, receivingep'paratus of each being closely associated with the transner that/the former is enabled to actuate the lstterand thereby toderelop in the receiv:

ing-circuit currents similar to those which, under the influenceof the transmitteret the distant terminnl ststion, were originally pro tlnced in the transmittingob-chit. In this way the nesseges transmitted over the first circuit are relayed upon the second circuit withrenewod strength. switch is placcd'in ench circuit at the central station can is responsive to current changing e. plinnces at the distant terminal station of It essicl circuit. Its office is to transfer the main circuits from either'one of its branch extensions to the other as the direction of transmission changes. I

More specifically each mtiin circuit divides sit the repeetingstation into two branches, one of which passes through a receiving or other passes preferably through the secondary winding of an induction-coil, whose primary winding is con-- nected up in. circuit with a. suitable battery anda transmitter, the said transmitter being arranged-in close juxtaposition to the receiver or relay-magnet of'the other circuit, so that;

it is'in operative relation thereto and adapted to be operated thereby.

In each circuit at. the repeatingstation is an electromagnet Whose armature constitutes or nctuntes a swi ch which controls the coin ,switehof the circuit which at An electromagnetic determining by its position which branch shall st any moment be so connected and which This electro form of s. poles-1 to the operationlefi; temporarily disconnected. magnet is preferably in the iced-relay and is responsive of a reversing-key at the'ter'niinal station of 3 its circuit, which reverses the direction of the current of a battery or similar generator flowing in the main circuit. In operation the ngiven. moment is transmitting should be placed to connect.

the receivingbra-nch with the main circuit,

the transmitting-branch being left open or disconnected, while at. the same time the switch of the reversing-circuit is so pieced thatits circuit connects with the trunsmib ting branch; its relay or receiving branch be ing then disconnected, To reverse the direction of tronsmissi'on'both circuits reverse the position of their switches. I V

In connection with each polarized switch I prefer to place no electrostatic shunt-circuit round the eleotromagnot; thereof; formed ofa condenser and connecting-wires, and its function is to facilitate the passage of voice-currents while retaining the. electro This is magnet in the conductive-circuit for the nee I cssnry operation of the switches.

In the d rawingswhich accompany and 1llustaste this specification, Figure 1 15 a diagram of the circuits and e'ppsratus'of the system,

key connections. l

In Fig. 1, C is a. central and A and ing terminal telephone-stations.

and Fig. 2 is a detail diagram of the reversing- L is a main telephonercircuit extending from A to G, and if a. similar telephone-circnit extending'frozn B to 0, and. etC these circuits are to be operati veiy n cited by means ofiepesting-or relayapparatus'. The line conductor 4 of each circuit, on reaching the station 0, leads through the electronic-gust.

m of an electromagnetic switch, shown as it polarized relay, connection st 12 with the armntnre a; ofthe Boutly and then by the Wire fto a said magnet, which armature is adapted to-be attracted by one pole or the other of the noti y.v

net and to move betwecnthe contact-stops and r. The armature may therefore be 'garded as the terminal oi? the conducts The other main conductor 5 of each rosin,

cuit with a suitable source of electrical en-- ergy, such asa. voltaic battery b, and the variable-resistance medium 25. 1 i. v

A diaphragm or armature is placed between the receiving-magnet ofeach line and the j uxtaposed transmitter of the other line, and be ing vibrated in response to the varying attraction of the said magnet it communicates like motion to the variable-resistance medium of the relay as was initially comm unicated, to the transmitter at the original sending-station A or B, and the message is thus repeated by one line into the other, the available force being renewed by bringing a second source 1) into operation.

In operation one of the circuits-say L- that which at any given moment is transmitting, is connected by the armature of its polarized switch m,'which is in contactwith the stop r, with its receivingmagnet branch 8, the transmitting branch of this circuit being open at the stops; but the switch of the second circuit L must at this time have its armature in contact with the stop s, sothat it is completed througn'ihe secondarycoil of its transmitter; Under these circumstancesL repeats into L.

At the outlying stations.A.and B may be placed reversing-keysK controlling the direction ot a current which, by the manipulation of either member of said key-k or 1.5 may be impressed on the main circuit. If the member is be depressed the positi've 'pole y will be connected to wire 5 and the negativerpole to wire 4,. and the direction of the cnrrent'will be out over conductor 5 and back over conductor 4, and the armat' ure a of the polarized switch will move in a given direction, say toward the stop 7'; but if k be pressed the. connections are reversed and the direction of the current will be out over the wire!, and back over 5, in which case the armature will move over to the opposite contact'stop s.

Thus thecontr ol of the transmitting and receiving'branches of each circuit is placed with the outlying stations of such circuit; and whe'mafter the transmission of speech in one direction, it becomes necessary to reverse the direction of such transmission both. terminal or outlying stations are required to reto a certain extent oppose the passage 05 voice-currents,l provide an electrostatic shunt for such voice-currents round the said electromagnet, this being constructed by interposing a. condenser c and necessary connectionse between the points 12 and 13. By this devices vpath of low impeden'ce is provided for voiceassess currents, while a continuous conductive cir-,

cult is maintained throughthe magnet-coils for switching, calling, or other auxiliary currents.

At the stations A and B the station-telephones T are shown ,asbeing connected in a.

bridge between the points j and j on the mains, but they can of course be connectedin any desired and usual way. Y

The reversing-battery S is on open'circuit during the transmission of conversation, and, if desired, the loop to the reversing-keys may be opened by turning the switches s Having fully described the invention, I claim- 1 1. .In a telephone relay or repeater apparatus the combination of two main telephone circuits, each having two alternative terminal branches extending respectively through a re:

induction coil; an electromagnetic switch for each circuit; controlling the relation of the -.said circuit to its said two branches; and current changing devices for each circuit, controlling the polarized switch of the said cir cuit substantially as described.

2. The combination in a telephone repeater, of two main telephone circuits, extending from the two outlying stations to a central station; two branch extensions for each, one containing a transmitting apparatus and the other a receiving apparatus, the transmitting.

apparatus of each being-in operative relation to the receiving apparatus of the other; and .-a polarized switch in each main circuit respohsive to a current reversing device at the outlying station of thesaid circuit, and acting to transfer the said circuit-from either one of its branch extensions to the other.

3- The combination at a central station, of two main telephone circuits entering the said lay magnet and the secondary winding of an station from distant terminal stations; an extension branch for each containing the secondary winding of a transmittinginduction coil; a second extension branch for each com taining a relay or receiving magnet; a trans mitting apparatus in circuit with the primary winding oc the said induction coils, each placed in perative proximity to the relay mag-net of the other; a. current reversing device such as a reversing key for each circuit, placed at the outlying terminal station thereof; a'polarized relaysw-itch in'cach main'cir- 'cuit controllingtthe connection of the said circuit with its relay and induction coilwindings respectively-and an electro-static shunt round the electro-megnet of .each oftlie said polarized-switches, to facilitate the, passage of voicecurrents substantially as specified.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, this 7th day of March, 1895; is

. 'WlL'lON- In, RICHARDS.

. Witnesses: Geo. WILLIs PIERCE, 1; JOSEPH A. GATELY. 1 

